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Chemistry - tests on Group 2 + volumes of gases evolved watch

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    What's the most accurate qualititave test for the Group 2 Metals?

    Ways of evaluating the volumes of gas evolved during a reaction.
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    (Original post by Jono300)
    What's the most accurate qualititave test for the Group 2 Metals?

    Ways of evaluating the volumes of gas evolved during a reaction.
    The words 'qualitative' and 'accurate' don't really go together.

    Qualitative tests for group II metal ions depend on precipitation of the sulphate and hydroxides, and flame tests.

    Ba2+ has a very insoluble white sulphate and a soluble hydroxide. Salts give an apple green flame test.
    Sr2+ has a fairly insoluble sulphate and a slightly soluble hydroxide. Salts give a crimson flame test.
    Ca2+ has a fairly insoluble sulphate and a slightly soluble hydroxide. Salts give a brick red flame test.
    Mg2+ has a soluble sulphate and an insoluble white hydroxide which does not dissolve in excess NaOH or NH3
 
 
 
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